Re: Port Scanning with Languard and nmap question

["Bruno G. San Alejo" <bgonzalez () polar es>]

Hi, maybe you should ask this question at the namp list cause there is a 
wide range of issues with the way nmap translates the results. Better to 
run it in very verbose mode and see what nmap says about the answers it 
gets. Don't merely trust the program, but have a look yourself. Even 
better, run Ethereal and check out the packets you get back from the 
target. Then you can interpret the results. Also read the paper: "The 
art of port scanning" at the insecure site. It'll give you some insight 
in how to dig out what's going on.

HTH. Later.



Carl Wilson wrote:

> I scan network devices (such as network
> copier/scanners) for open ports and services running
> before allowing our users to permanently hook them to
> the network. I use nmap 3.70 and Languard. My question
> is why do I see different results when both are
> configured to look for the same range of ports? (TCP
> and UDP) Primarily, the UDP scan of the device returns
> ports 53 (DNS), 69 (TFTP), 177 (xdmcp), and 445 (SMB).
> Most all the time, Languard does not detect 53, 69,
> and 177. 
>
> We had the local user run the scan directly connected
> to the device and their results did not find 53, 69,
> or 177 open. Any ideas why? Is there something in
> scanning across a WAN which would cause these ports to
> show as open? Thanks.
>
> Carl
>
> =====
> Carl H. Wilson
>
>
>                 
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